std_msgs/Header header
float64 measurement_time 
uint16  gps_week       
float64 gps_time       
float64 gyro_x          
float64 gyro_y          
float64 gyro_z          
float64 accel_x         
float64 accel_y         
float64 accel_z          
float64 lon              
float64 lat              
float64 alt              
float64 roll             
float64 pitch            
float64 heading         
float64 acc_x            
float64 acc_y            
float64 acc_z           
float64 ang_vel_x        
float64 ang_vel_y        
float64 ang_vel_z       
float64 vel_east        
float64 vel_north        
float64 vel_up           
float64 speed            
uint8  num_sats_master  
uint8  num_sats_slave   
uint8  system_state     
uint8  status           
float64 diff_age        
float64 lon_std          
float64 lat_std          
float64 alt_std          
float64 roll_std         
float64 pitch_std        
float64 heading_std      
float64 vel_e_std        
float64 vel_n_std        
float64 vel_u_std        
float64 speed_std 
float64 utm_x
float64 utm_y
float64 utm_z